One thing you got to understand is that people like Michael Johnson,Carl Lewis,Usain Bolt are not normal people : they are FREAK OF NATURE , they are the GENETIC ELITE OF THE WORLD, and human specimens like them are born one every miliion.
But to think that this 3 athletes are clean is FUCKING RETARDED,just like thinking that Jay Cutler is clean too.
The big difference is that without steroid and HGH this 3 athletes (Michael Johnson, Carl Lewis,Usain Bolt) would always be SUPREME ATHLETES when instead Jay Cutler without drugs would be only a FAT WHITE BOY.